Rounding Addition
Round each decimal to the nearest one, then solve.
2.8 + 1.3 =
3 + 1 = 4
Round each decimal to the nearest ten, then solve.
37.58 - 21.25 =
38 - 21 = 17
Four friends ordered two pizzas. The cost of each pizza is $13.80. About how much will it cost for both pizzas. Decide if it should be exact or estimated, then solve.
The question is asking for an estimated answer.
$13.80 -> $14
14 + 14 = 28
Both pizzas will cost about $28.
45.6 + 4.62 =
50.22
Round each decimal to the tenths place, then solve.
16.85 - 4.59 =
16.85 -> 16.9
4.59 -> 4.6
16.9 - 4.6 = 12.3
Round each decimal to the nearest tenth, then solve.
5.88 + 1.03 =
5.9 + 1 = 6.9
Round each decimal to the nearest hundredth, then solve.
8.279 - 5.633 =
8.28 - 5.63 = 2.65
A gardener has 35 feet of fencing to enclose a garden. All four sides are 8.4 ft long. How much fencing will be leftover after the garden is enclosed. Decide it it's exact or estimated, then solve.
This question is asking for an exact answer.
8.4 x 4 = 33.6
35 - 33.6 = 1.4
The gardener will have 1.4 feet of fencing of leftover.
73.21 - 8.001 =
65.209
Round each decimal place to the hundredths, then solve.
23.079 + 19.732 =
23. 079 -> 23.08
19.732 -> 19.73
23.08 + 19.73 = 42.81
Round each decimal to the nearest hundredth, then solve.
8.058 + 5.739 =
8.06 + 5.74 = 13.80
Round each decimal to the nearest one, then solve.
34.921 - 14.099
35 - 14 = 21
A family is renting a cabin for $59.95 a day for 3 days. About how much will they pay for the cabin? Decide if it needs an exact or estimated answer, then solve.
This question is asking for an estimated answer.
$59.95 -> $60
60 x 3 = 180
The family will pay about $180 for 3 days in the cabin.
18.8 + .73 =
18.07
Madison drove 58.6 miles to the beach, 67.2 miles to her grandmother's house, and 60.5 miles to back to her house. About how far did Madison travel? Decide if it's exact or estimated, then solve.
This question asks for an estimated answer.
58.6 -> 59, 67.2 -> 67, 60.5 -> 61
59 + 67 + 61 = 187
Madison traveled about 187 miles.
Round each decimal to the nearest ten, then solve.
25.21 + 19.47 =
26 + 20 = 46
Round each decimal to the nearest tenth, then solve.
52.85 - 9.09 =
52.9 - 9.1 = 43.8
A restaurant can make 95 dinners each night. The restaurant has been sold out for 7 nights in a row. How many dinners were sold during this week? Decide if it's an exact or estimated answer, then solve.
This question is asking for an exact answer.
95 x 7 = 665
665 dinners were sold during this week.
11.005 + 13.04 =
24.045
17.03 - 13 =
4.03
Malcolm buys a taco for $2.79 and milk for $1.29. Rounding to the nearest dollar, about how much does he spend?
$2.79 -> $3
$1.29 -> $1
$3 + $1 = $4
Malcolm spends about $4.
The weight of Marisa's TV is 52.7 lbs and the weight of Toni's TV is 43.9 lbs. Rounding to the nearest one, about how much more does Marisa's TV weigh than Toni's?
52.7 -> 53
43.9 -> 44
53 - 44 = 9
Marisa's TV weighs 10 more pounds than Toni's TV.
Mrs. Trainer needs to purchase a classroom response clicker and a new calculator. A clicker costs $31.99 and a calculator costs $11.75. About how much money will it cost to buy both? Decide if it's exact or estimated, then solve.
This question needs an estimated answer.
$31.99 -> $32, $11.75 -> $12
$32 + $12 = $44
Mrs. Trainer will need about $44 for her clicker and calculator.
14.22 - .89 =
13.33
Evita has 9 quarters, 7 dimes, and 5 nickels. Does she have enough money to buy a box of crayons for $3.25? Decide if it's exact or estimate, then solve.
This question needs an exact answer.
9 quarters = $2.25, 7 dimes = ¢.7, 5 nickels = ¢.25
$2.25 + ¢.7 + ¢.25 = $3.20
Evita has exactly $3.20, so she does not have enough money to buy the box of crayons.